JEE Main Chemistry question

Electron affinity is positive, when [BCECE 2006]

(A)O changes into
(B) changes into Correct
(C)O changes into
(D)Electron affinity is always negative

Answer: (B)

Solution

Adding the first electron to neutral oxygen () is exothermic (energy released, i.e. negative by this convention), but adding a second electron to the already negatively charged () requires overcoming electrostatic repulsion between the ion and the

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Question ID VK-133196